Research Article Search Results
Enormous South Sea Cultured Pearl Filled with Cultured Pearls
An unusually large cultured pearl was filled with multiple cultured pearls, perhaps after the emergence of an original single-bead nucleus.
Rubies from the Montepuez Area
In October 2013, GIA’s Bangkok laboratory produced a study of the samples collected during the September 2012 expedition.
Optical Defects in Diamond: A Quick Reference Chart
A simple chart on optical defects in diamond, including those that produce coloration and fluorescence colors.
Fluorescence Produced by Optical Defects in Diamond
How variations in UV lamp output can affect observed fluorescence color and intensity.
CVD-Grown Synthetic Diamonds, Part 3: Detection
CVD synthetic diamonds are readily detected in a gem laboratory, in specimens of any size or color.
Diamond Mining in Minas Gerais, Brazil
A first-person account of diamond mining in Minas Gerais, Brazil, which has been a source since the early 1700s.
CVD-Grown Synthetic Diamonds, Part 2: Properties
The physical properties of CVD synthetic diamond fall well within the range for natural diamonds in terms of hardness, thermal conductivity, strength, and so forth. Therefore, CVD synthetics are as hard and durable as natural diamond and display the same brilliance and fire when cut as a gemstone.
Update on Sapphire Mining in Ilakaka-Sakaraha, Madagascar
Three CVD Synthetic Diamonds Submitted to Mumbai Laboratory
The gemological and spectroscopic characteristics of these type IIa synthetic diamonds suggested that they experienced different growth and/or treatment histories.
Undisclosed Samples of Large CVD Synthetic Diamond
In mid-2012, one of the international diamond grading laboratories in Antwerp reported undisclosed CVD synthetic diamonds, causing a stir in the diamond industry.
Rare Double-Trapiche Emerald
At the AGTA show, Equatorian Imports showed this contributor two pieces of emerald with a very rare double-trapiche pattern
Natural Pearls from Australian Pinctada Maxima
Explores the fascinating history of natural pearling in Australian waters and examines the properties that might help distinguish these natural pearls from those that are accidentally produced during the culturing process.
